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For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Looking inside Java classes - javap and javadoc

javap is a program that looks inside a Java class and reports on all the methods and variables that are exposed by that class ... so it's looking at a Java class's object format.

javadoc is a program that analyses Java source code and reports on all the methods that are exposed by that class.

javap is command line based, but javadoc produces a whole web site in HTML format ... here's the javap output from our "Time" class from this week:

Dorothy-2:java grahamellis$ javap Time
Compiled from "Time.java"
public class Time extends java.lang.Object{
  public int hour;
  public int minute;
  public int second;
  public static int howmany;
  public Time(int, int, int);
  public Time(int, int);
  public int getsid();
  public int gethour();
  public void setforward(int);
  public java.lang.String getdef();
  public int getgap(Time);
  public static int getcount();
  static {};
}


And here's part of the javadoc output from the same class:

Explore the full javadoc tree from this week if you wish. It's in HTML, using frames (so I can't easily provide you with a link to the intermediate pages without doctoring files and URLs!) but it WILL take you all the way from Adam to Zoe!

(written 2009-09-25)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
J706 - Java - Objects and Classes
  [96] Variable Scope - (2004-10-22)
  [477] Class, static and unbound variables - (2005-10-25)
  [1163] A better alternative to cutting and pasting code - (2007-04-26)
  [1296] An example of Java Inheritance from scratch - (2007-08-08)
  [1500] First Class Java. First step and moving forward. - (2008-01-10)
  [1906] Long, Longer, Longest in Java - (2008-11-25)
  [1925] Introduction to Object Oriented Programming - (2008-12-06)
  [2169] When should I use OO techniques? - (2009-05-11)
  [2616] Defining a static method - Java, Python and Ruby - (2010-02-01)
  [2651] Calculation within objects - early, last minute, or cached? - (2010-02-26)
  [4413] Binomial Coefficient (Pascal Triangle) objects in Java - (2015-02-03)
  [4422] Objects - from physical to virtual or abstract - Java - (2015-02-10)

A502 - Web Application Deployment - Java - Basic Tools
  [754] tar, jar, war, ear, sar files - (2006-06-10)
  [1082] Straight from the .jar - (2007-02-16)
  [1192] What are WEB-INF and META-INF directories? - (2007-05-18)
  [1562] Java Compiler - needs all classes, compiles them all too - (2008-03-03)
  [1771] More HowTo diagrams - MySQL, Tomcat and Java - (2008-08-24)
  [1909] javax.servlet cannot be resolved - how to solve - (2008-11-26)
  [2153] Class Loading and Variable Conversion in Java - (2009-05-02)
  [2859] Using java, javac, jar, and CLASSPATH - a simple example - (2010-07-07)
  [3151] Disassembling Python and Java - previously compiled code - (2011-01-29)
  [3819] Packing a tar, jar or war file - best practise - (2012-07-26)
  [4412] Java -making sure you have the right versions - (2015-02-02)


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What is a JVM, a JRE, a JDK - components of the core Java Environment
Some other Articles
Which version of MySQL am I running?
Weekend and Christmas Promotion - Well House Manor Hotel, Melksham
A Winter Weekend Special at Well House Manor
What is a JVM, a JRE, a JDK - components of the core Java Environment
Looking inside Java classes - javap and javadoc
Sorting Collections of Objects in Java
Exceptions in Java - why and how
Where is my Java class?
Viv.java uses unchecked or unsafe operations - explanation and cure
Java Programming Fundamentals
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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